Mask



FIG. 1 is a top perspective view of a mask showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

All features illustrated in phantom line are expressly disclaimed and form no part of the claimed design. 

CLAIM The ornamental design for a mask, as shown and described. 